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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841ae409880dca4774b05e4982540380ba5e383838e73c724a662e2bae2d8592' 
  AND token = '/s1ABOTOUPMAZWa/loFGaScmte3lnRhPDvouu7Nn0tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}